14 THE UNIVERSITY SCIENCE BULLETIN. 
air, and so, flying from place to place, often betake them- 
selves in quest of food to other waters. This is always their 
course when the ditches in which they inhabit come to be 
dried up. This affords us a satisfactory reason for the great 
number of insects that immediately appear in the smallest 
collections.of water, since they may very well get thither when 
it is dark, so that the opinion which ascribes to putrefaction, 
the power of forming insects, must by this instance of the 
water scorpion’s nocturnal transmigration appear more and 
more frivolous and unnecessary.” 
Reaumur (1736) unfortunately did not write of water bugs, 
and Linne (1746-58) busied himself with setting in order our 
knowledge of natural history. Roesel (1746-1761) published 
four volumes, well illustrated, and in his work gives some at- 
tention to the water bugs. De Geer (1752) produced a seven- 
volume work “Memoirs pour servir a l’/histoire des Insectes.”’ 
A little later Geoffrey (1762) gave his ‘‘Histoire abrégée des 
Insectes.”” De Geer’s ‘‘Abhandlungen zur Geschichte der In- 
sekten,” 1778, contains some splendid wood cuts, and in Vol. 3, 
considerable biological matter on water bugs. Oliver’s work 
appeared in 1782. Fabricius must be mentioned in passing, 
because of his influence in the realm of the systematic. His 
“Entomologia systematica” came out in 1794, and his “Sys- 
tema Rhyngotorum” in 1803. The first five years of the 19th 
century are memorable ones for students of the Hemiptera. 
Walchenaer, 1802, published ‘“‘Faune parisienne, Insectes, ou 
histoire abregee des Insectes des environs de Paris, etc.,” and 
herein gives biological data on the aquatics. Tigny, 1802, pub- 
lished a compilation and Latreille gave to the world his splen- 
did set, “Histoire naturelle générale et particuliere des Crus- 
tacés et des Insectes.”’ Again in 1807 there appeared another of 
his works “Genera Crustaceorum et Insectorum secundum or- 
dinen naturalem in familiar desposita inconibus exemplisque 
plurimis explicata.”” About this time Wolff and Rossias pub- 
lished less important works. Thus we find Fabricius, Latreille, 
Walchenaer, Tigny, and lesser workers producing much work 
from 1800 to 1805. Lamarck (1816) brought out another 
large set on insects and other invertebrates. He called his 
work “Histoire naturelle des animaux sans vertebres MS 
In volume 3 there are some splendid old matters concerning 
water bugs, notes on progression and feeding. As is often 
