60 HALF-AN-HOUR AT THE MICROSCOPE. 



sale at the London opticians were prepared by an excellent 

 entomologist, the Rev. J. Thornton, of Aston Abbotts. To 

 purchasers and students these were invaluable, from their having 

 the correct names attached ; be it constantly borne in mind that 

 without this, and the help thus afforded to the acquiring a 

 knowledge of the natural objects whence taken, all these 

 beautiful objects really have almost no value. 



EXPLANATION OF PLATES IIL, lY., AND V. 



Plate III. 



Fungus on Sow-Thistle. 



Fig. 1. — Leaf of Common Sow-Thistle, natural size, with spots of its 

 parasitic fungus on the under-surface. 



,, 2. — Portion of the same, enlarged 3 diameters. 



,, 3. — Section through a fresh leaf containing the fungus, x 100 

 diameters. 



,, 4. — Spores found in December, 1874, x 200 diameters. 



5, 5. — Spores of Coleosporium senecionis, Groundsel Brand, drawn to 

 same scale. 



,, 6. — Seed of Stellaria aquatica. as viewed with a moderate power, 

 the elaborate dove-tailing of the cells forming the side, and 

 papillose condition of these round the margin are shown. 



Plate IV. 

 Upper portion illustrates White Excrescences on leaf : — 

 Fig. 1. — One of the excrescences, x 25 diameters. 

 ,, 2. — Dead leaf of Holly, having fungi on its upper surface very 

 similar to the above. 



,, 3. — One of the " white excrescences " of the Holly leaf, enlarged 

 to the same extent as Figr. 1, 



,, 4. — Another of these bodies from the Holly leaf, ruptured and 

 showing the pedicle, x 25 diameters. 



,, 5. — Portion of the structure highlj^ magnified: — a, stellate cells 

 forming the outer covering ; b, branching mycelium, with the 

 ends of which the stellate cells are covered ; c, spores. 



,, 6. — A spore enlarged to twice the extent, x 50 diameters. 



Lower portion of the Plate illustrates Spiracle of Larva 



of Stag-Beetle : — 

 7. — Represents the spiracle as seen, enlarged 50 diameters. 



8. — Portion of the sieve-like frame-work, supporting a membrane 

 of extreme tenuity. The coarser arborescent frame-work is 

 indistinctly seen on a lower level — i.e., more internally. 

 X 400 diameters. 



Plate V. 

 Egg of Parasite of Hornbill. 





