114 THE MICROSCOPE. Aug. 



real benefaction to every student of microscopy, as ap- 

 pears from the eagerness with which they have been 

 sought in this country the past six years. 



IN'umber 44 is a transverse section of a snowthistle 

 stem and shows the collenchyma. This is a tissue of 

 vegetable cells which are thickened at the angles and 

 usually elongated. It is closely related to parenchyma, 

 but has the cells more elongated. It can be found in 

 the yellow dock and cow parsnip, in the petiole of the 

 summer grape and of the begonia. 



Number 59 i.s a transverse section of the one-year-old 

 stem of Ivy. It shows the resin cells. 



Number 39 is a transverse section of the anther of 

 Crown Imperial. 



A catalogue of all these objects can be found in the 

 January number of The Microscope for 1893, where 

 there are also directions for mounting them upon glass 

 slips when so desired. 



vStrasburger's Manual of Vegetable Histology, Prof. 

 Bastin's College Botany, Carpenter on the Microscope 

 and Behren's Guide to the Microscope in Botany are 

 good books to use in studying these objects. 



To Clean Balsam Mounts. — Use a strong solution of caus- 

 tic potash. Apply with a brush. 



