14S 



IIARDWICKE'S SCIENCE-GOSSIP. 



NOTES FOR SCIENCE CLASSES. 

 No. VI. 



Hepatic^. 



SPECIMEN for use of students : Common Liver- 

 wort. (Marchantia fo'ymorfha, L.) 

 Every year it is becoming more important that 



microscopic examination. Many students fail in the 

 examination, who have confined themselves simply 

 to text-books. We commence with the Liverwort, 

 because it is in an excellent state for study in the 

 early summer months. 



There are two divisions of the Hepaticse, known 

 as the Thallose and Foliose group. In the latter wc 



p#t 



ilMi 



Fig. 87.— Thallus of Marchantia. 



Fig. SS. — Long, section of Epidermis of Marchantia. 



*<<* 



Fig. 90. — Amphigastria of Marchantia. 



-2 

 -3 



Fig. 91.— Trans, section of Thallus of Marchantia, to show Stomata. 



Fig. 92. — Cup, with gemmae. 



Fig. 89. — Gemma, magnified. 



Fig- 93- — Trans, section of Thallus, through the Conceptacle. 



the student should be practically acquainted with the 

 life history, in connection with classification ; to do 

 so, he must not only know the chief types, but have 

 also a practical knowledge of their life history by 



have a familiar example in the Jungermannise, which 

 have a stem bearing scale-like leaves, without 

 midrib, standing in two rows, running in right or 

 left-handed spirals. Neither group are possessed 



