204 



Parasitic Mange in Horses. 



[JUNE, 



chiefly to keep the centre of each tree sufficiently open, its 

 chief fault being density of growth. 



Blenheim Orange forms one of the largest of trees of the 

 dessert class, its slowness in bearing being favourable to 

 rapid wood growth. It requires fully as much room as 

 Warner's King or Peasgood's Nonesuch. As its branches 

 are sturdy and generally well directed, a minimum of pruning 

 is necessary for it, and any excess delays fruiting. Among 

 late-keeping dessert apples, D'Arcy Spice Pippin, second 

 only to Cox's Orange in flavour perhaps, does no good 

 in my garden, and it failed equally in another garden 

 over the London clay, though it grows with fair 

 vigour in Essex, and fruits well. Duke of Devonshire, a 

 fair substitute, does well, and its compact habit of growth 

 makes it a capital garden variety. Claygate Pearmain, a 

 delightful eating apple from November till February, if not 

 till March, grows with fair vigour in spreading form, but is 

 liable to canker. Mannington's Pearmain, at least as good 

 as a dessert apple, grows feebly on this soil. 



The majority of the varieties of apples named above are 

 also grown in another plantation, on a loam over the clay. 

 In this case the differences in vigour of growth are less marked 

 than they are in the orchard over a subsoil of sand, but they 

 are relatively the same, as also are the respective habits of 

 growth. 



PARASITIC MANGE IN HORSES, ASSES, AND 



MULES. 



The term mange is applied to an infectious disease of the 

 skin caused by the action of mange mites. There are three 

 varieties of mange which affect these animals : — (i) Sarcoptic, 

 caused by Sar copies scabei; (2) Psoroptic, caused by 

 Psoroptes communis; and (3) Symbiotic, caused by Chori- 

 optes symbiotes. 



The mange mites belong to the order of acarina (mites). 

 They are small creatures round or oval in shape, and usually 

 only visible when magnified by the use of a hand lens or 

 microscope. When fully developed they have four pairs of 

 legs, but only three pairs in their earlier or larval stage. The 

 legs are furnished with suckers, bristles, and claws. From 



