47. _Are the Combinations Mutes or Semi-vowels?_
They are all Semi-vowels.

48. _What letters are called Nasals?_
M, N, and Ng.

49. _What other term is often applied to the Semi-vowels?_
Loose Consonant.

50. _What letters are called Liquids?_
L, M, N, and R.

51. _Why are the Liquids so called?_
Because of their flowing sound, which readily unites with the
sound of other letters.

52. _What are Sibilants?_
Letters which have a hissing sound; as, S and Z.

53. _What letter is called the Mute Sibilant?_
The letter X.

54. _What letters represent no sound of their own?_
C, Q, and X.

55. _What are these letters called?_
Redundant letters.

56. _Why are they so named?_
Because they are not necessary for the completion of the Alphabet.