144 



LETTERS TO MR. GIBB 



[CHAP, xv 



number of the little " water snails/' Limncea truncatula, (such 

 tiny shells !), which is their host in the early stage, with 

 figures of the intermediate conditions, would be of useful 

 interest ; also a couple of bottles with contents of sparrows' 

 crops, showing the great amount of corn they eat, as well 

 as a number of locusts in the condition in which they are 

 importad in lucerne from Buenos Aires. 



November 26, 1895. 



This sort of brickdust-like deposit is, I think, eggs. I had 

 a quantity of it sent me about six weeks ago by a fruit 

 salesman and auctioneer who had got 10,000 apple trees 



Infested apple spray, natural size ; wingless viviparous female and 



young clothed with cottony fibres above ; and small egg-bearing 



female beneath the spray ; pupa with little cottony growth all 

 magnified. 



FIG. 28. AMERICAN BLIGHT, WOOLLY APHIS, SCHIZONEURA LANIGERA, 



HAUSM. 



infested. It agrees in measurement and colour, &c., with 

 the general description given by Mr. Frazer Crawford 

 (of Adelaide) of the eggs of the Red spider, Bryobia 

 ? speciosa, (fig. 52) found on apple in South Australia, but I 

 do not think we can be quite certain of its nature until the 

 contents hatch. About ten days ago I thought that I found 

 fungi developing in the patches, so I sent a good supply to 

 Professor M. C. Potter (Botanical Professor of Durham 

 College of Science), for I was sure whatever he would say 

 would be trustworthy. He wrote me that there was fungus 



