LECTURE ON ENTOMOLOGY. 63 



was received for glabra, but was of a different color, and he thought 

 it lateritia. It was of very striking and attractive appearance ; of 

 brick red or vermilion color and not so gross a grower as B. spec- 

 tabilis. 



Lectuke on Entomology. 



The Chaiiman then introduced B. Pickman Mann, who spoke on 

 Entomology, in substance as follows : — 



The interest of the horticulturist in insects is in theu' relation to 

 plants, but entomology cannot be successfully studied in this 

 economic aspect without a knowledge of technical entomology. If 

 a person finds his apple trees eaten by an insect, he may not recog- 

 nize it until it is too late to prevent the injury. If he applies to a 

 neighbor for infomiation, it may prove to be the canker worm, tent 

 caterpillar, palmer worm or some other insect. If it is a canker 

 worm he must provide against two kinds which have very different 

 habits, — the fall and spring canker woi-ms. The former comes out 

 of the ground in the autumn, and continues to ascend the trees until 

 April, excepting from the middle of Januar}^ to the end of February, 

 crawling on the trees and laying its eggs in patches on the bark. 

 The other does not make its appearance until spring, and can be 

 distinguished by the possession of a long tube, by means of which 

 it lays its eggs in crevices, etc. If the insect proves to be the tent 

 caterpillar (^Clisiocainpa) , the cultivator must know the proper sea- 

 son to attack it. Frequently the best time to attack insects is when 

 they can only be discovered by search. The chrysalis of the cab- 

 bage butterfly is readily accessible, and is attacked by a little wasp, 

 so that in destroying the chrysahs we may destroy many of our 

 friends, as may be proved by collecting a quantity of the chrysahdes 

 and placing them in a wu-e cage, when it will be found that a large 

 proportion will produce no butterflies, but there will issue from them 

 many of the little wasps which have been the cause of their de- 

 struction. These considerations show the importance of such an 

 exact knowledge of insects as can only be acquired by a special 

 student. 



Of 200,000 known species of insects we have 30,000 in this 

 country, and of this number, not a large proportion, — only about 

 2,000 species, — are so injurious as to be of importance. Some 

 knowledge of insects can be obtained empirically or by tradition, 

 but it is often misapplied ; the means which have proved effectual in 



