154 BRITISH HYDRACHNIDiE. 



I drew my figures, the colour is identical in both. Miiller gives a 

 figure, but not coloured. Neuman gives a beautiful drawing in 

 colour, but the colour does not quite correspond with those found 

 by me ; neither does the shape, but this may be only a local varia- 

 tion of the same species. 



The body of the female is nearly round, flattened in the front 

 part. The body of the male is pear-shaped. On the fourth joint 

 of the fourth leg of the male will be seen a peculiar process, which 

 is also found on males in other genera. The legs of the male 

 are also stronger and better developed than they are in the female. 



EXPLANATION OF PLATE X. 



Fig. 1. — Dorsal view of female. 

 2. — Ventral view of ditto. 

 3. — Side view of palpi of female. 

 4. — Fourth leg of female. 

 5.— Dorsal view of male. 

 6. — Ventral view of male. 



J) 



5 J 

 5) 

 J) 



Pain in the Eyes. — Pain in the eyes after reading or minute 

 work of any kind is often due to spasm of the muscle of accom- 

 modation. Engravers and workers with the microscope frequently 

 suffer severely. The pain comes on after prolonged application, 

 and is usually of a dull aching character. Not infrequently it is 

 attended with a little feeling of sickness and considerable depres- 

 sion of spirits. The best thing is to lie down in a dimly-lighted 

 room when the pain comes on, and place over the eyes and eye- 

 brows a pad of lint dipped in cold water. A small piece of 

 mustard-leaf to the temples or behind the ears will ease the pain. 

 We have found relief from bathing the eyes with a very weak 

 solution of atropine, prepared by putting a drop or two of the 

 solution of atropine (liquor atropice) in a tumbler full of water. 

 It is to be used occasionally as a lotion, but must not be taken 

 internally. Arnica often does good ; it should be taken according 

 to Pr. 42, and also applied locally in the form of the arnica lotion 

 (Pr. 94). When the pain is the result of prolonged work by 

 gaslight, nux vomica (Pr. 44) may be used. 



— From '* The Family Physician " for March. 



