296 
NOTES AND MEMORANDA. 
evolved would be likely to break a bottle, and the vessel placed out- 
side the window until cool, when no more injurious vapour will be given 
off. A gross or two of slides may be cleaned in an incredibly short 
time by sliding them one by one into a vessel containing the liquid, 
tilting the vessel about a few moments to cause the liquid to flow 
through the mass, then pouring it otf, and placing the vessel under 
the stream of a tap. The solution is well known to photographers."^ 
Miniature 3Hcroscope. — A diminutive instrument, small enough to 
be carried in the waistcoat pocket, and available for viewing objects 
mounted on the ordinary slides, has just been brought out by Mr. John 
Browning. It is made in nickel silver, and has two achromatic 
powers, magnifying respectively 15 and 35 diameters (the latter 
with a Lieberkuhn), as well as a movable mirror and forceps. The 
accompanying woodcut of the instrument is full size. 
Notommata Wef'necMi — a Parasite of VaucJieria. — Besides the well- 
known Notommata parasita which inhabits Volvox glohator, there is 
another species of the genus living in an Alga which has hitherto been 
little observed. M. Balbiani having obtained some specimens from 
M. Cornu, has made an extended investigation, not only of the animal, 
but of the so-called “ galls ” of the VaucJieria which they inhabit. 
The article appears in the ‘ Annales des Sciences Naturelles,’ but, 
though published so long ago as 20th March, the plate has not 
yet (October 15) reached London. When this is done it is proposed 
* ‘ American Naturalist,’ vol. xii. p. 573. 
