250 LETTERS TO DR. NALEPA [CHAP. xxi. 



This is indeed a most acceptable help, for there were some 

 of the quite minutely technical terms that I had failed to 

 make out the meaning of, and now you have most excel- 

 lently got over my difficulties for me, and I thank you very 

 much for the same. Since I wrote to you at Gmiinden I 

 have had great pleasure and benefit in procuring some of 

 your valuable publications, so full of excellent descriptions 

 and figures. One of these is the separate impression of 

 your paper, read on January 24, 1889, with 9 plates, in- 

 cluding p. n, of which you have now sent me this valuably 

 explained copy. 



Another the separate impression for February i3th 

 contains description, p. n, and figure, plate iv., of Phytoptus 

 pyri, and I have also a copy of your " Genera und Species 

 der Familie Phytoptidae," 1891. Now I think, thanks to 

 study of your clear descriptions, I have a fair knowledge of 

 the characteristics of a Phytoptus, and of the divisions of 

 the Family Phytoptidae. When I publish my next Annual 

 Report I should very much wish to give my readers some 

 better information than I have hitherto been able to do, and 

 to point to them from what source I obtained it, and how 

 they may obtain it for themselves. I think I have your 

 kind permission to use one of your figures. I am therefore 

 having a very careful copy executed of your P. pyri (plate iv., 

 fig. i), of the two claws (in your Genera and Species, 

 plate ii., qa and 6), together with an attacked leaf from life 

 (Fig. 64). 



Your part would be a most soundly valuable aid to 

 readers here, for really and truly I doubt if more than very 

 few among us are aware (say) that the legs of the Phytoptus 

 are made up of claw, tarsus, tibia, and so on, much less that 

 the claw is of this peculiar shape. I confess to you I was 

 ignorant of this myself. I should like to give a part of your 

 description of the P. pyri to show what a description ought 

 to be ; also to allude to the species which you were so good 

 as to name for me, and to your principle of classification 

 (p. 317 of " Katalog"). Should any of this not be accord- 

 ing to your pleasure, I beg of you kindly to tell me. I 

 should indeed be ungrateful if, after all your kind help, I 

 trespassed on your information against your wish. Should 

 you allow it, you may depend on me to quote accurately, so 

 that my quotations will send readers to your works, not 

 enable them to use my report as a robbery of you ; also I 

 would fully and honestly acknowledge the source of my 

 information, and be truly grateful. I wish I could send you 



