104 
A Supposed Mammalian Tooth 
rMonthly Microscopical 
L Journal, Aug. l, 1869. 
June 12th. — Watched an Amceba from water containing Conferva, 
and saw changes. Also several transparent globules, transformed to 
Amcjeba. 
April 2Sth. — Again witnessed the monads, freely moving in the 
terminal vacuole of Lyngbya. 
May 20tJi. — In water containing Euglena (put up May 11th) found 
Oscillatoria, Paramoecia, Euglena, Amoeba, Yibrions, green Gonidia 
(Euglena?), and diatoms. 
Aug. 20th. — In a bottle containing Oscillatoria in water, found 
a bright pink frond resembling Palmella cruenta, no purple cells. 
Green Oscillatoria in all stages. 
April 21st. — Found (in a hothouse) a plant of Palmella cruenta 
passing to green ; red cells in red frond, but absent in green part. 
April 21th. — Another examination of a green part of a frond of 
Palmella cruenta from a hothouse ; no red cells, all green. 
May 11th. — On the green edge of a moist frond of Palmella 
cruenta are very fine filaments of Oscillatoria. 
The red cells gradually enlarging and assuming a green tinge. 
May 11th. — On the surface of a liquid containing Lyngbya (May 
9th) is a shining pellicle of Oscillatoria. 
May 10th. — In a green rim on the surface of Lyngbya water (which 
on May 4th consisted of Euglena), are now numerous filaments of 
Oscillatoria. 
April 21st. — Examined Oscillatoria, in which the vacuole seems in- 
creasing in size, and the chlorophyll masses becoming more distinct. 
May 6th. — Put a solution of Antimonii potass tartarate into two 
bottles, one with only a globule of air, the other half-full of air. 
May ISth. — Liq. ant. pot. tart, in bottle half-full of air, contains 
round cells, like monads (still) and Mucedo. 
Dec. 8th. — Opened the bottle with only a globule of air, no 
Mucedo, amorphous film at bottom. 
Dec. 8th. — Examined Glucosuria put up Nov. 13, 1868. 
In bottle containing half air, found very large Mucedo. 
In bottle with only a globule of air, no traces of Mucedo. 
VIII. — A Supposed Mammalian Tooth from the Coal-measures. 
By T. P. Barkas, F.G.S. 
I HAVE recently, through the kindness of Mr. John Brown, Shield- 
field, Newcastle-on-Tyne, been favoured with the examination of a 
slide which he has prepared containing a tooth and a portion of 
a jaw from the fossil remains of the Northumberland Coal-measures. 
There is at present in Newcastle and its neighbourhood great 
interest in the fossils of the Coal period, and several gentlemen have . 
been engaged for a considerable time in preparing and mounting 
Coal-measure fossils for examination by the microscope. Thousands 
of sections have been made; and, besides those I have personally 
