160 TEAIS! S ACTIONS S OF THE ILLINOIS 



The foregoing comprise all the varieties that I have fruited, with three or foi;r unim- 

 portant exceptions. One of my neighbors has found the Passe Colmar very healthy 

 in tlie tree and exceedingly productive of large, fine fruit, ripening in October, Tne 

 Easter Buerre has also been fruited in my neighborhood for several years. The 

 trees are healthy and moderately fruittul. This variety we regard as- very valuable on 

 account ol its fine quality and late period of maturity— January to March. 



Mr. Minkler moved that Mr. Barry and Dr. Furnas have the privi- 

 lege of taking from the collection such apples as they may desire. 

 Carried. 

 Dr. Henry Shimer^ of Mt. Carroll^ read 



AN ESSAY ON THE BARK LOUSE. 



Mr. President, Ladies and Gentlemen: 



By previous arrangement, we will now take up the study of the Bark louse, very 

 briefly, in the following order: 

 History and Classification . 



" Kinds,^'' or methods of making distinctions, as of genera and species. 

 Special Baric Lice, of various kinds, concluding with the Apple Bark Louse. 

 1st, Its nature and organization. 

 2d, Its food, consequences, etc. 

 3d, Methods of propagation and distribution. 

 4th, Restraining influences. 

 In studying the '" Bark louse ' ' on the present occasion, it is necessary that we have 

 some fixed and definite limits for the term. There are certain peculiar and well 

 defined characters that mark a class of insects that have usually been found upon the 

 bark of trees. They are well known among gardeners and others, imder the name of 

 "scale insects," "mealybugs," "shield lice," etc., and are erroneously supposed 

 all to be entirely destitute of legs. 



"WTien this same insect takes up its abode upon a leaf, or on the fruit of a tree, 

 we apply, for convenience sake, an arbitrary rule and still pronounce it a ''Bark 

 louse," just as we all persist in pronouncing the pediculi capitis, a head louse still, 

 although it has so far transgressed the rules of decent behavior, as to wander away 

 from its more natural home in that nicely braided or well powdered hair, and by 

 accident, perchance, may be caught on the fair neck of that beautiful young lady, or 

 on the glossy collar of that very exquisite and attractive young dandy in the public 

 assembly. 



The late learned Entomologist of our State, whose sad fate and untimely end we aU 

 mourn with sorrowful hearts to-day, was very particular to separate the terms, " plant 

 lice " and •' Bark lice " so that they might have a comprehensive appellation. Applying 

 the fonner to the Aphidae, and the latter to the Gocciim, and thus, if possible, have an 

 English name for each of these great classes, as definite as are the scientific names 

 themselves. 



