INDIRECT INJURIES CAUSED BY INSECTS. 161 



from one of them, and even then some had escaped. 

 What other purpose these two remarlcal>le purses are 

 intended to answer it is not easy to conjecture. He sup- 

 poses that the parent fly must enter the nostrils of the 

 deer, and pass down the air passages to oviposit in them : 

 but probably such a manoeuvre is unnecessary, since 

 there seems no reason, supposing' the eggs to be laid in 

 the nostrils, why the larva when hatched cannot itself 

 make its way down to the above station, as easily as that 

 of the sheep into the maxillary sinuses. Or, which per- 

 haps is more likely, Avhen the animal draws in the air, 

 the eggs or larvae may be carried down with it, in both 

 cases, to the place assigned to them by Providence^. 



No animal, however, is so cruelly tormented by 

 ffistri as the rein-deer ^ for besides one synonymous 

 apparently with this of the deer (CE. nasalis^ L.) from 

 which they endeavour to relieve themselves by snort- 

 ing and blowing'', they have a second which produces 

 bots under their skin ; not improbably the same species 

 that in a similar way attacks the latter, as I have stated 

 above. We have heard that the vaccine disease is de- 

 rived from the cow and the horse, and the small-pox is 

 said to have oris^inated in the heels of the camel : but 

 neither the ingenious Dr. Jenner nor any other writer 

 on this subject has informed us that the rein-deer is sub- 



* For the account of the CEstrusof the deer, see Reaum. v. 67-77. 



^ Linn. Lack. Lapp. ii. 45. In the passage here referred to, Linne 

 speaks of two species of C^jPTUs, though the mode of expression indicates 

 that he considered tliem as the same. One was ffi. nasalis from which 

 they freed themselves by snorting,&c., the other CE. Tarandi which formed 

 the pustules in their backs. In Syst. Nat. 969. 3. he strangely observes 

 under the former species, " Habitat in eqttornm fauce, per nares intrans ! ' ' 

 confounding probably (E, vdcrinus of Mr. Clark with tiie true £E. nasalis. 

 VOL. I. M 



