54 CORRESPONDENCE. 



described, although it was clearly shown that many apodal 

 larvas move without legs. To some, these organs would be a 

 comparative hindrance to locomotion, because their natural 

 requirements in seeking for food only occasion slight differences 

 in situation and posture. The tubercular legs of many were well 

 described, and attention called to the Rose Aphis with its six rows 

 of tubercles, containing seven homogeneous legs in each row, 

 with a total of 42 for the creature's use. The position of some 

 of these legs is very curious. Reaumur describes legs on the top 

 of the backs of certain insects. There is the grub of a little gall- 

 fly, found upon the under side of oak leaves, which has upon the 

 middle of each segment of its upper surface a retractile fleshy 

 protuberance resembling the spurious or pro-legs of a caterpillar. 

 This position is an admirable provision for the creature's wants in 

 the pecular spherical home which it inhabits upon the under side 

 of leaves. The next portion of the paper described the pedate 

 larvae which move by proper or articulated legs in distinction from 

 those before mentioned, and the remainder of the paper was occu- 

 pied by describing the legs and feet of the perfect insects. 

 Numerous slides were exhibited to illustrate the subject, and a 

 cordial vote of thanks was tendered to Mr. Allen for the reading 

 of the paper. 



Correeponbence. 



The Editors do not hold themselves responsible for the opinions or 

 statements of their Correspondents. 



To the Editor of " The Journal of the Postal Microscopical Society." 



Sir,— 



I should much like to learn the opinion of my brother 

 members on the subject of Microscopic Demonstrations, when 

 there are 30 or 40 people to whom objects are to be shown by 

 these instruments. 



On the other hand, I have collected much information on 

 projecting Microscopic objects on a screen, which I shall embody 

 in one or two papers, if the members will care to have it. 



Carey R Coombs. 



[We shall be very glad to insert Dr. Coombs' paper.— i?^.] 



