The American Monthly Microscopical Journal, Volume 31882 |
From inside the book
Results 1-5 of 20
Page
... Aperture , Microscopic Angular . 76 " Guides for Science Teaching ' 220 Aperture , Numerical ... 66 95 Aperture , Numerical , Table of ... 66 156 Aperture , Simple Method of Determin- Hydrurus i jego Pokrevienotivo " .. 180 ...
... Aperture , Microscopic Angular . 76 " Guides for Science Teaching ' 220 Aperture , Numerical ... 66 95 Aperture , Numerical , Table of ... 66 156 Aperture , Simple Method of Determin- Hydrurus i jego Pokrevienotivo " .. 180 ...
Page 12
... angular aperture of the objective . The sub- stage is moved up and down upon its bar by a rack and pinion , as usual . Its centering arrangement is placed behind the ring , and consists of a rack and pinion , and a screw similar to the ...
... angular aperture of the objective . The sub- stage is moved up and down upon its bar by a rack and pinion , as usual . Its centering arrangement is placed behind the ring , and consists of a rack and pinion , and a screw similar to the ...
Page 46
... angular aperture of the objective must not be too large , as then the stereoscopic effect will be exaggerated , as Carpenter has well shown . He found that a 1⁄2 - inch of 40 ° gave the true stereoscopic effect . It should be remembered ...
... angular aperture of the objective must not be too large , as then the stereoscopic effect will be exaggerated , as Carpenter has well shown . He found that a 1⁄2 - inch of 40 ° gave the true stereoscopic effect . It should be remembered ...
Page 61
... Aperture . BY HON . J. D. COX , F. R. M. S. The discussion of the question of angular aperture has resulted in a general agreement among scientific men that apertures in excess of the maximum for dry glasses , are both practicable and ...
... Aperture . BY HON . J. D. COX , F. R. M. S. The discussion of the question of angular aperture has resulted in a general agreement among scientific men that apertures in excess of the maximum for dry glasses , are both practicable and ...
Page 68
... angle at the princi- pal focus , both of the telescope and the microscope , as well as the full size of the ... angular aperture of the micro- scope . Second , that in low - powers by the pencil from B. If then the pencil from ...
... angle at the princi- pal focus , both of the telescope and the microscope , as well as the full size of the ... angular aperture of the micro- scope . Second , that in low - powers by the pencil from B. If then the pencil from ...
Other editions - View all
Common terms and phrases
acid alcohol algæ angle of aperture angular aperture animals apparatus appear bacteria balsam band binocular blow-fly body Canada balsam cells centimetre centre chlorophyll coal color croscope crystals cyclosis described desmid diameter diaphragm diatoms disease examination exchange exhibited experiments eye-piece fact field filaments fluid focus Foraminifera glass glycerin histology illumination inch infusoria instrument interest ject jective JOURNAL lens lenses light lines liquid living mass material matter meeting membrane ment method micro micrococci Microscopical Society microscopists minute motion nature numerical aperture observed obtained ocular optical organisms paper placed plants plate pollen-tubes potash prepared present prism Prof protoplasm Protozoa rays refractive refractive index resolving rotifers scopical seen slide solution species specimens spicules sponge spores stained structure substance surface swarm-spores tain telescopic tion tissues tube ture turmeric vegetable York
Popular passages
Page 118 - Ann, and is about three and a-half miles by coach from the Eastern Railroad Company's station in Gloucester. The purpose of this Laboratory is to afford opportunities for the study and observation of the development, anatomy and habits of common types of marine animals under suitable direction and advice. There will...
Page 145 - ... the protoplasm, when its life is gone. Professor Huxley writes concerning protoplasm thus : — " The properties of living matter distinguish it absolutely from all other kinds of things ; and," he continues, " the present state of our knowledge furnishes us with no link between the living and the not living.
Page 146 - ... protoplasm should once have appeared on the globe, as the result of no matter what agency ; in the eyes of a consistent evolutionist any further independent formation of protoplasm would be sheer waste.
Page 166 - ... have no personal ends to serve in an inquiry in which I happen to be a personal factor. Let us then have a test which will forever set at rest this vexed question of resolution. I submit for your consideration the following outline of a test which I venture to think will be sufficient and conclusive: Let Mr. Fasoldt rule three plates under as nearly the same conditions as possible, except in the number of lines in the different bands of each plate. Let him label each plate and accompany it with...
Page 118 - Aerial disinfection, as commonly practised in the sick-room, is either useless or positively objectionable, owing to the false sense of security it is calculated to produce. To make the air of a room smell strongly of carbolic acid by scattering carbolic powder about the floor, or of chlorine, ,by placing a tray of chloride of lime in a corner, is, so far as the destruction of specific contagia is concerned, an utterly futile proceeding.
Page 167 - I observed in the contents a few well defined orange spores, but none of them appeared to have germinated. Fastened between the hairs on the limbs of each of the flies examined I found a number of the spores, and the efforts of the fly to get rid of them only resulted in attaching them more firmly to it. They might, however, be brushed off by objects with which they were brought in contact, while their germinating powers would long outlast the life of the insect itself. It was evident from this experiment...
Page 35 - In such cases as these, external conditions act upon the larvae as they do upon the mature form; hence we have two classes of changes, adaptational or adaptive, and developmental. These and many other facts must be taken into consideration; nevertheless naturalists are now generally agreed that embryological characters are of high value as guides in classification, and it may, I think, be regarded as wellestablished that, just as the contents and sequence of rocks teach us the past history of the...
Page 220 - A bibliography of the Microscope and Micrographic Studies, being a catalogue of books and papers in the library of Julien Deby.
Page 191 - Thus, a mite of a wheel animalcule, l-100th of an inch long, will perhaps appear to be a foot off, and as large as a mouse ; but bring the prisms nearer together, and tilt the oculars to correspond, and the image waxes marvellously immense, and taking a position perhaps apparently more than a hundred feet distant, the being, too small to be seen with...