being rather short but very thin and pointed. The oeso- 

 phagus could be traced back for a short distance. The 

 anus appears to be situated at about 0*021 ram. from the 

 posterior end. The nerve ring is located relatively far back, 

 being 0'07 mm. from the anterior end. The cuticle is very 

 finely ringed, a few being indicated in the figure. Barnard 

 and Park 1 drew attention to these very delicate structures 

 and devised an ingenious method of using them to obtain 

 the total length of the adult. They found that there were 

 at least four hundred transverse striae on the embryo, and 

 on the supposition that these markings must necessarily 

 become separated to form the striae of the adult, they 

 argued that the multiplying of the distance between any 

 two embryonic striae by 400 should give a rough estimate 

 of the average length of the worm, viz., 36 inches. This 

 agrees fairly well with our estimation of the length especi- 

 ally when one takes into consideration the fact that the 

 striae of the embryo are very small and closely placed, and 

 therefore hard to measure accurately. Any slight error 

 must therefore become considerably accentuated when 

 multiplied by 400. Our examination indicates that there 

 must be many more than 400 rings in an adult worm, and 

 this fact, together with the crowding together of those 

 near the head end, at once discounts this method of esti- 

 mating the total length. Barnard and Park gave the 

 length of the embryo as being about one hundredth of an 

 inch. Gibson's 2 measurements are 0'00i mm. wide by 0*25 

 mm. long. The embryos are capable of active movement 

 in water for hours alter their extraction from the nodule. 

 Filaria Nodules in Camels.— We have examined some 



