288 On an Apparatus for collecting ['j^SmJl. •nlnerm'^ 



a vane ; but by changing the position from horizontal to vertical, 

 attaching another short tube (/, Fig. 4), with a metal pipe ter- 

 minating in a small funnel, and placing a Hghted lamp beneath it, 

 it can be used over a cesspool in any nook or corner, in an ordinary 

 room, in a cow-shed or stable, or near a patient suffering from any 

 infectious disease. 



It consists in the main of two light tin funnels (a, h) (one rather 

 larger than the other, and supplied with four wing offsets), united 

 by two or more stout brass tubes for convenience of use. The 

 smaller funnel has a diameter of 5 inches by 3 inches in depth, the 

 larger of 5^ inches by 8-|- inches in depth. The smaller funnel is 

 continued into a tube of li inch diameter by 6 inches long, to the 

 end of which is fixed or screwed a conical finely-turned cone, with 

 a pipe nozzle (Fig. 5) having a screw thread on its outside and a 

 tapering bore within. On the sides of the 6-inch tube, at alternate 

 positions, are placed three smaller funnels 1, 2, 3. The tube of the 

 funnel fits tightly into the brass tube (c), which is 2 inches long by 

 If diameter ; the short tube of the large funnel fits over the brass 

 tube (d), which has nearly the same measurements as (c), and thus 

 the centre of gravity can be easily found. 



The brass tube (c) has at its junction with (d) an internal thread 

 screw, and is free throughout its length. The other tube (d) has its 

 external thread screwing into (c), but moreover a finer internal thread 

 into which is screwed the diaphragm stage plate (e, Fig. 2), and which 

 consists of a thick milled plate of brass, with a fine thread outside, 

 and pierced with a central hole about -j^ths of an inch in diameter, and 

 by a series of six small holes external to it (Fig. 3, e, e). On the side 

 facing the nozzle of the 6-inch pipe of the smaller funnel a narrow 

 ring or raised edge is left in the turning, and abutting nearly against 

 its edge on either side are two bent wii-e springs. Between this 

 narrow ring and the springs is inserted a clean thin covering glass, 

 fths of an inch square (Fig. 2, e). On the surface of the cover 

 facing the aj^erture of the nozzle, which can be separated from it a 

 variable distance, is placed a minute quantity of any prepared medium 

 of a transparent and glutinous nature, but somewhat hygrometric, as 

 glycerine or purified treacle with acetate of potash, &c., or the fluid 

 medium, modified if necessary, suggested in my article " Mucor 

 Mucedo," in the January No. of this Journal for the present year ; 

 adopting the most useful, if the cover is to be placed on a growing 

 shde (as suggested in the same paper), or in a cultivating appa- 

 ratus, or to be simply examined without attempts to development. 



From the under-surface of the stout brass tube (c) is fastened a 

 smaller tube with a solid end, into which is drilled a small conical 

 depression, to receive the pointed end of the support or pivot (k), 

 the other end of the support having a screw and nut by which it is 

 fastened to the surface-plate of a tripod stand. 



