TABLE IV.

THE CHARACTERISTICS OF VARIOUS FAMILIES OF VIRUSES

				Virions with cubic symmetry			Virions with helical symmetry
Viridae	Nucleic acid	Symmetry	Naked (N) or enveloped (E) nucleocapsid	Number of capsomers	Diameter of the nucleocapsid (å)	Diameter of the envelope (å)	Diameter and length nucleocapsid of the (Å)	Dimensions of the enveloped virions (Å)	Mol. wt. of nucleic acid (× 106)	Number of nucleic acid strand (5)
Ino-	D	H	N				5–6 × 760–850		1,7–3	1
Pox-	D	H?	E				?	2500 × 1600	160–240	2
								3000 × 2300
Micro-	D	C	N	12	250				1,7	1
Parvo-	D	C	N	32	220				1,8	1
Denso-	D	C	N	42	200				1.6–2.2	1
Papilloma-(papova)	D	C	N	72	450–550				3–5	2
Adeno-	D	C	N	252	700				20–25	2
Irido-	D	C	N	812	1300				126	2
Herpes-	D	C	E	162	775	1500–2000			54–92	2
Uro-	D	BC	N	—	—					2
Rhabdo-	R	H	N				20 × 130			1
							10 × 1250
Myxo-	R	H	E				90 × ?	1000	2–3	1
Paramyxo-	R	H	E				180 × ?	1200	7,5	1
Stomato-(rhabdo)	R	H	E				180 × ?	1750 × 680	6	1
Thylaxo	R	H	E				?	1000	10	1
Napo	R	C	N	32	220–270				1,1–2	1
REO	R	C	N	92	700				10	2
Cyano	R	C	N	32 or 42	540				—	2
Encephalo	R	C	E	?	?		600–800		2–3	1