12 



CONNECTICUT GEOL. AND NAT. HISTORY SURVEY [Bull. 



treated in relation to mineralogy and dynamical geology, so that 

 the student may learn somewhat of the agencies by which the 

 different types of rocks are produced, as well as their composi- 

 tion and characteristic aspect. Both in the general and the 

 special part of the work attention is given chiefly to those charac- 

 teristics of rocks which can be recognized by the naked eye or 

 by the simple microscope, with comparatively little reference 

 to the phenomena which can be observed only by the examina- 

 tion of thin sections under the compound polarizing microscope. 

 This limitation in the treatment of the subject renders the work 

 adapted to the use of comparatively elementary students. The 

 usefulness of the work in the high schools and other institutions 

 in the state will be greatly enhanced by the distribution to those 

 institutions of suites of specimens of rocks from the typical 

 localities described in the special part of the paper. These 

 specimens were for the most part collected in the summers of 

 1905 and 1906. They will be distributed, as soon as the bulletin 

 is published, to colleges, normal schools, high schools, and acad- 

 emies in the state, on condition that the respective institutions shall 

 pay the cost of transportation. Any suites of specimens remain- 

 ing in the possession of the Survey after such distribution may 

 be sold and the money paid into the treasury of the state. 



The bulletin on the Insects of Connecticut forms the begin- 

 ning of a series of papers on that class of animals, whose pub- 

 lication may be distributed through a considerable number of 

 years. It is needless to comment on the economic importance 

 of the class of insects, many insects being among the worst 

 enemies of the agriculturist, while others, insectivorous or par- 

 asitic in habit, tend to hold in check the destroyers of agricultural 

 products. The various parts of the work will be written by 

 specialists on various groups, under the general direction of 

 Doctor Britton. The present bulletin includes two parts of the 

 proposed work. Part I. gives a brief outline of the general 

 characters of insects and their relations to other allied groups of 

 animals, the classification of the group, and their economic re- 

 lations. In Part II., Mr. Walden gives a catalogue, with analyt- 

 ical keys, of the two orders, Euplexoptera and Orthoptera. The 

 former order is a small and comparatively insignificant one, 

 including the insects commonly called earwigs. By many ento- 

 mologists the Euplexoptera have been regarded as merely a 



