rior. More than 200 species are enumerated in this list which have 

 not before been credited to the region of the Lake. The collections 

 were made at Bayfield, Wisconsin, during June and July. 



The following introductory remarks are of sufficient general interest 

 to be quoted at some length. The time for an accurate map of the 

 faunal regions of the continent has not yet come — nor will it before 

 another century at least of careful investigation has enabled us to fix 

 approximately the range of the rarer forms of insect life. It is evident 

 to any one who will read with care and with some understanding of the 

 general principles of distribution, that many of the recent theories as to 

 t he division of our country into " life-zones " have very little foundation 

 in fact. If better proof were wanting of this, we might point to that 

 of authors changing from year to year their arbitrary arrangement of 

 our zoo-geographical regions— uniting to-day two or three of those of 

 older authors, and separating them again a few months later on. All 

 this may or may not be progress, but it will all have to be gone over 

 again in the light of a wider knowledge than seems to be at present in 

 the possession of certain writers who cannot rest without having first 

 shown us that all previously conceived ideas are totally wrow, and 

 that their explanation of the distribution of life is the only plausible 

 one. A single group of animals may or may not indicate in a general 

 way the lines of distribution followed by a larger number — but it is 

 manifestly unreasonable to hope for a stable method of division of a 

 country into life-zones before the life of that country is well-known. 



EMBRYOLOGY. 1 

 The Effect of Lithiumchloride upon the Development of 

 the Frog and Toad egg (R. fusca and Bufo vulgaris.) 2 — The 

 results of the series of experiments performed in the histological labora- 

 tory at Munich with this salt seem of no little interest, and especially is 

 this the case with the result obtained with a 0-5 per cent solution. In 

 -every instance the eggs were placed in the solutions (varying from 1 

 per cent to 0"2 per cent) between a half and an hour and a half after 



