Each of these diseases is described and the methods of treatment discussed in the above bulletin.

Professor A. D. T. Cockerell, of the University of Colorado, makes some interesting suggestions in a recent number of Science (32: 205. 1910) regarding the preservation of type specimens. The appointment of a committee by the American Association is recommended, this committee to investigate and report upon the condition of types in various institutions in this country and to designate certain museums as fit places for their preservation. The principles enunciated by Professor Cockerell are as follows:

"1. A type is, from its nature, in some sense the property of the scientific world. Thus, every one would consider it a criminal act to purchase and then willingly destroy a type. It must be considered reprehensible to permit types to exist where they are in serious danger of being destroyed, and, in particular, steps should be taken to prevent the sale of types to miscellaneous unknown collectors after the death of the original owner.

"2. Every institution possessing types should publish a complete list of those in its custody, and subsequently annual lists of additions. It can then be held strictly accountable for their care, and students can ascertain where the types are to be seen.

"3. No types should ever be loaned out and, especially, they should never be sent through the mails. Experience shows that institutions which profess to have a rule against the loaning of types can not be trusted to keep it."