SCIENCE- GOSSIP. 



89 



fcions illustrating the eggs of Ankvlostome, Round, 

 and Whip Worms, Billiarzia and Distome ringeri, 

 also of Imoeba coli and Trypanosomes. We do not 



know w li.-il demand there may lie in I lie- tropics for 



.in instrument of this sort, but it is certainly de- 

 signed to stand the maximum of bad asage without 



Baker's Plantation Microscope. 



ill-effect, and should prove sufficient for its purpose. 

 We would scarcely recommend it, however, for any 

 other than the purpose for which it is designed. 

 The price complete is only £2 5s. This and the 

 foregoing microscope are those recently exhibited 

 before the Royal Microscopical Society. 



Baker's R.M.S. 1.27 Microscope.— Mr. Chas. 

 Baker has recently brought out a new microscope, 

 specially designed for advanced workers, which 

 both in design and workmanship deserves notice 

 in these columns. The stand is of the solid tripod 

 type, which, whilst giving nearly as firm a base, 

 even in the horizontal position, as the true tripod, 

 is in some respects preferable to this latter 

 form in the greater facility afforded for getting at 

 the sub-stage adjustments when the microscope is s 

 used vertically. The limb is of the "Jackson" 

 form with lever fine adjustment, than which we 

 have found none more sensitive or serviceable. 

 Each revolution of the milled head gives a move- 

 ment of 11 millimetre (—^ inch). The body 

 has two draw-tubes, giving a variation of tube- 

 length from 120 to 250 millimetres, thus enabling 

 objectives corrected for both the short and the 

 long tube to be used at will. Both draw-tubes are 

 graduated in millimetres, and the lower one is 

 actuated by rack and pinion ; a very useful addi- 

 tion when adjusting objectives so as to correct 

 them for different thicknesses of cover-glass, 

 especially in view of the growing tendency to 

 make such corrections by this means instead of 

 by the provision of a correction collar to the 

 objective itself. The body is of a large diameter 

 that should lend itself to photography, and the 

 eyepieces are of the new R.M.S. No. 3 standard 

 size. There is a mechanical stage giving a move- 



ment of 25 millimetres in either direction, and 

 graduated to half millimetres, and the stage is 

 capable of rotation for about 280°. The top plate 

 is provided with three adjustable stops for 3 inch 

 x 1 inch and 3 inch x 1| inch slides with a view to 

 greater facility in recording positions, and if re- 

 quired a large flat plate is available. The sub- 

 stage is of the usual form with centering screws, 

 coarse and fine adjustments, the latter being ex- 

 ceptionally neat and so conveniently placed that 

 both adjustments can be controlled without shift- 

 ing the hand. There are the usual mirrors. All 



Baker's R.M.S. MicROSCor-E. 



the fittings are sprung, and have adjusting screws 

 to compensate for wear. The price of the stand 

 alone, without case, is £16 16s. 



Ova OF Lepidoptera. — Recently we had the 

 opportunity of carefully examining some hundreds 

 of water-colour drawings of British Lepidoptera. 

 They were the work of our correspondent Mr. E. 

 Wheeler, of Queen's Road, Clifton, near Bristol, 

 who had faithfully delineated under the microscope 

 the external structure and markings. As in most 

 cases he had made drawings at various periods of 

 the development of the embryo within the egg, this 

 study proves to be one of much interest, as is also 

 the ease with which butterflies and moths may be 

 classified by the external structure of their eggs 



