1900] MICROSCOPICAL JOURNAL. 25 



pointed not to find Bacillaria iu clay (Lacustrine sedi- 

 mentary deposits) in a kettle-hole the first I visited for 

 gathering diatoms. I reasoned that it was a kettle-hole 

 on the edge of the glacial moraine and wondered why 

 clay containing Bacilliaria was not present. When I 

 knew of the way kettle-holes on the borders of glacial 

 moraines were made (by the clay on the surface of the ice 

 and rushing down through a conical funnel-shaped hole to 

 the moraine below), I then saw why it was they could be 

 formed without clay in them also. The bottom of these 

 kettle-holes are clear moraine stuff, but such kettle-holes 

 are not common. One of these near here, by the village 

 of Union, known as the old ship hole is 250 feet long, in 

 the northwest, by 59 feet in the opposite direction. The 

 bottom is clear glacial gravel without signs of clay any- 

 where. It is covered by trees down to the bottom. Near 

 by is a well-marked kame pointing in the same direction. 

 It is on the borders of a stream, the Elizabeth river, which 

 has Bacillarian clay at the bottom. I cannot be sure that 

 the Bacillarian clay is glacial or recent, but no clay is 

 found near by which is glacial. 



BIOLOGICAL NOTES. 



L. H. PAMMEL. 



The Compound Oospore of Albugo bliti. — In the Botani- 

 cal Gazette for October (28 : 225) Mr. F. L. Stevens con- 

 cludes his paper on the Development of the Compound 

 Oospore of Cystopus bliti. The oogonium when cut off 

 from the parent hypha contains about 300 nuclei, which en- 

 large and divide mitotically while the oosphere is being dif- 

 ferentiated. "The oosphere is differentiated through a 

 massing of the cytoplasm of the oogonium. By this pro- 

 cess the nuclei, usually in stages of mitosis, together with 

 the vacuoles, are expelled from the central region and there 

 results a dense and coarsely vacuolate periplasm. This 

 condition occurs when the antheridial tube is very short." 



