diff --git a/spacy/vectors.pyx b/spacy/vectors.pyx
index 5512279ae..cea583110 100644
--- a/spacy/vectors.pyx
+++ b/spacy/vectors.pyx
@@ -32,22 +32,20 @@ cdef class Vectors:
     cdef public object keys
     cdef public int i
 
-    def __init__(self, strings, data_or_width=0):
+    def __init__(self, strings, data=None, width=0):
         if isinstance(strings, StringStore):
             self.strings = strings
         else:
             self.strings = StringStore()
             for string in strings:
                 self.strings.add(string)
-        if isinstance(data_or_width, int):
-            self.data = data = numpy.zeros((len(strings), data_or_width),
-                                           dtype='f')
+        if data is not None:
+            self.data = numpy.asarray(data, dtype='f')
         else:
-            data = data_or_width
+            self.data = numpy.zeros((len(self.strings), width), dtype='f')
         self.i = 0
-        self.data = data
         self.key2row = {}
-        self.keys = np.ndarray((self.data.shape[0],), dtype='uint64')
+        self.keys = numpy.zeros((self.data.shape[0],), dtype='uint64')
 
     def __reduce__(self):
         return (Vectors, (self.strings, self.data))
diff --git a/spacy/vocab.pyx b/spacy/vocab.pyx
index 205e5a2af..e6ba9944b 100644
--- a/spacy/vocab.pyx
+++ b/spacy/vocab.pyx
@@ -62,12 +62,10 @@ cdef class Vocab:
         if strings:
             for string in strings:
                 _ = self[string]
-        for name in tag_map.keys():
-            if name:
-                self.strings.add(name)
         self.lex_attr_getters = lex_attr_getters
+        print("Create morphology", list(self.strings), tag_map)
         self.morphology = Morphology(self.strings, tag_map, lemmatizer)
-        self.vectors = Vectors(self.strings)
+        self.vectors = Vectors(self.strings, width=0)
 
     property lang:
         def __get__(self):
@@ -338,7 +336,7 @@ cdef class Vocab:
             if self.vectors is None:
                 return None
             else:
-                return self.vectors.to_bytes(exclude='strings.json')
+                return self.vectors.to_bytes()
 
         getters = OrderedDict((
             ('strings', lambda: self.strings.to_bytes()),
@@ -358,7 +356,7 @@ cdef class Vocab:
             if self.vectors is None:
                 return None
             else:
-                return self.vectors.from_bytes(b, exclude='strings')
+                return self.vectors.from_bytes(b)
         setters = OrderedDict((
             ('strings', lambda b: self.strings.from_bytes(b)),
             ('lexemes', lambda b: self.lexemes_from_bytes(b)),