NOTES AND MEMORANDA. 233 



now know belongs to the ciliated infusoria. There is every evidence 

 that at least their regular and normal mode of production is from 

 germs disseminated in the atmosphere ; and they themselves, as we 

 have already seen, are embryonic or transitional forms in the develop- 

 ment of a distinct vegetable growth. They are consequently to be re- 

 garded as an integral part of the oryptogamic vegetable organizations ; 

 and, notwithstanding the apparent simplicity of their structure, they no 

 doubt, like other plants and animals, have their definite place in the 

 organic world." 



NOTES AND MEMOKANDA. 



Papers "standing over." — Owing to the pressure on our space, 

 we regret being compelled to allow papers by the following authors to 

 stand over : — Dr. Lionel Beale ; Dr. Braithwaite ; Dr. R. H. Ward ; 

 Captain Hutton ; Mr. Isaac Eoberts ; and Mr. P. Braham. 



" Pattern Lead " for making Cells. — Mr. White, tha secretary of 

 the Quekett Club, and one of the members of our Council, stated at a 

 recent meeting of the club that for many years he had been in the 

 habit of using cells made of a thin kind of lead known as " pattern 

 lead," which was used by dentists for taking patterns for their gold 

 plates. It would be found to answer the puri^ose very well, and had 

 none of the objectionable qualities mentioned by Dr. Matthuws (in 

 his observations at same meeting), since the slide might be made 

 almost red hot without molting the cells, and the cells were very 

 easily stuck on with marine glue. For shallow cells a simple ring of 

 gold size, and gum dammar put on thickly and allowed to get hard, 

 answered the purpose very well, and if Bastian's cement were used 

 instead, the cell could easily be built up higher by adding layers 

 upon those which had become dry. Another way was to use the zinc 

 cells, which would stand any amount of heat ; acid, however, would 

 affect these, but vulcanite cells would resist acids. In making cells 

 for mounting in fluid, it would be found of great advantage to set up 

 some standard size, and keej) to it, as this would enable the worker in 

 a short time to estimate correctly the exact amount of fluid required 

 for filling — a matter of very much importance. 



Colonel Woodward's Paper in the April Number on ToUes' 

 Objective ^Vth Immersion. — Colonel Woodward has requested us to 

 add the following observation to his last paper, which, however, has 

 already appeared in print : — " Since writing the above paper I have 

 made photographs of the two frustules shown by the Wales' lens, with a 

 lens of Mr. Tolles' (a yLth immersion), which I think fully equal to 

 that by the Wales' objective. I may add that any of these objectives, 

 including the Becks' yVh, will resolve AmpJiipleura pellucida in balsam, 

 as, in fact, was done by Count Castracane with objectives by Hart- 

 nack and Nachet.* Count Castracane made photographs of the balsam- 

 mounted specimen on MoUer's type plate, and counted the stria3." 

 * See this Journal, April, 1871, p. 176. 



