182 NOTES. 



name has, through, mistake, obtained a measure of 

 notoriety not due to it. 



8. The letters and fractional numbers frequently 

 set after the references to the figures, indicate 

 the ratio which the figures bear to the size of 

 nature : thus n. s. signifies " natural size ;" ^, that 

 the figure is one-fifth of natural size ; and *, that 

 it is magnified ten times. 



9. For all hard names, look first for an expla- 

 nation in the notes with which each Class is 

 introduced; if it is not explained there, search 

 for it in the Glossary. 



10. Finally, do not be discouraged if you meet 

 with difficulties ; whatever is worth attaining is 

 worth persevering for ; there is no royal road to 

 science. It would be well to practise upon some 

 common animal whose name you already know ; 

 for example, the Prawn (Palcemon), the Lobster 

 (Homarus), the Crab ( Cancer) , the common Smooth 

 Anemone (Actinia) 9 the Sea-urchin (Echinus). 

 Take either of these, and compare it with the 

 characters given of its Class, its Order, its Family, 

 its Genus : you will not recognise all, but you 

 will find enough to afford you very useful practice, 

 and to increase your experimental acquaintance 

 with Zoology. 



